高频辅助变流器斩波电路共模谐振分析及抑制方法研究

Analysis and suppression of common-mode resonance in chopper circuitof high-frequency auxiliary converter

文章针对高频辅助变流器共模谐振的分析与抑制方法展开研究,提出了一种高效的共模等效建模方法。首先将“多噪声源”的变流器系统等效成多个“单一噪声源”模型,显著降低了系统的复杂度,便于分析特定噪声源产生的谐振。其次分析了高频辅助变流器斩波电路共模电流的时频特征和干扰耦合路径的转移导纳特性,揭示了共模谐振的产生机理。最后提出了一种从源头抑制谐振的方法,并通过仿真与试验验证了抑制方法的有效性。

This paper analyzes common-mode resonance in high-frequency auxiliary converters and explores a suppression approach by introducing an efficient common-mode equivalent modeling method.Firstly,the converter system with multiple noise sources was equivalently represented using several models with a single noise source.This significantly reduced the system complexity,facilitating the analysis of resonance generated by specific noise sources.Secondly,the generating mechanism of common-mode resonance was uncovered,by investigating the time-frequency characteristics of common-mode current and the transfer admittance characteristics of interference coupling paths within the chopper circuit of high-frequency auxiliary converters.Finally,a method for suppressing resonance at the sources was proposed,and its effectiveness was validated through simulations and experiments.